U.S. Vice President George Bush and his wife Barbara with Pope John
Paul II during an audience at the Vatican, June 24, 1985.
REUTERS/Luciano Mellace

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U.S. Vice-President George Bush addresses the 39 former Beirut hostages after their arrival at U.S. military airbase Rhein-Main from Syria July 1, 1985. REUTERS/Rob Taggart (GERMANY - Tags: POLITICS) 

Vice President George bush kisses the Western Wall after his visit to the Yad Vashem holocaust memorial in Jerusalem July 27, 1986. REUTERS/Jim Hollander ( JERUSALEM - Tags: RELIGION POLITICS) BEST QUALITY AVAILABLE 

Egyptian President Hosni Mubarak (R) meets with U.S. Vice-President George Bush at the Presidential Palace in Cairo, Egypt August 3, 1986. Bush, who ended a two-day tour of ancient monuments in upper Egypt, arrived in Cairo to discuss Middle East peace efforts with president Mubarak. REUTERS/Jim Hollander BEST QUALITY AVAILABLE 

British Prime Minister Margaret Thatcher and U.S. Vice President George Bush pause for the press on the porch of the Vice President's residence before a breakfast meeting November 15, 1986. The Prime Minister will travel to Camp David following the breakfast for a meeting with President Reagan. REUTERS/C. Combes (UNITED STATES - Tags: POLITICS) 

George Bush's granddaughter Ellie LeBlond shines a flashlight into his mouth during the opening ceremonies for Bush's January 18, 1989 presidential inauguration in Washington, DC, as Marilyn Quayle (L) and Barbara Bush (R) look on in this file photograph. George W. Bush, Bush's son, will take the oath of office on Saturday, becoming the 43rd president of the United States, and marking only the second time in U.S. history that a father and son have occupied the White House.

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U.S. President George H.W. Bush laughs while attending the annual White House Correspondents Association Awards dinner in Washington, May 21, 1988. REUTERS/Stelios Varias (UNITED STATES) 

Former first lady Lady Bird Johnson (L) applauds as U.S. President George H.W. Bush comments on her husband, former President Lyndon Johnson, April 6, 1990 during a reception honoring the 25th anniversary of Johnson's inaugural. Bush said that one of the former president's greatest accomplishments was in marrying Mrs. Johnson. Reuters/Stelios Varias (UNITED STATES - Tags: POLITICS) BEST QUALITY AVAILABLE 

President George H.W. Bush meets with his military advisors at the Pentagon to duscuss the Gulf crisis August 15, 1990. From left are: General Norman Schwarzkopf, chief of Middle East forces, Defense Secretary Dick Cheney, Bush and Chairman of the Joint Chiefs of Staff Colin Powell. REUTERS/Gary Cameron (UNITED STATES - Tags: POLITICS) BEST QUALITY AVAILABLE 

United States President George H.W. Bush and Secretary of State James Baker study prepared remarks at Bush's desk in the Oval Office on February 22, 1991 minutes before the President addressed reporters on the South Lawn. Bush demanded that Iraqi troops begin withdrawing from Kuwait by noon EST on February 23, and said the Soviet peace plan was unacceptable. REUTERS/Rick Wilking BEST QUALITY AVAILABLE 

President George H.W. Bush addresses U.S. military personel from different branches of the U.S. Armed Forces at an air base eastern Saudi Arabian city of Dhahran November 22, 1990, after arriving to celebrate the Thanksgiving Day holiday. REUTERS/Terry Bochatey ( SAUDI ARABIA - Tags: POLITICS CIVIL UNREST) 

U.S. President George H. W. Bush waves goodbye to U.S. Marines and members of the British 7th Armoured Brigade in this file image from November 22, 1990 as they conclude a Thanksgiving Day visit with troops in the Saudi desert. REUTERS/Rick Wilking/Files (SAUDI ARABIA - Tags: POLITICS) 

President George H.W. Bush carries his lunch tray as he walks among the troops during a Thanksgiving Day visit to an army base camp in eastern Saudi Arabia November 22, 1990. Bush and the First Lady were visiting three military sites during their holiday tour. REUTERS/Rick Wilking ( SAUDI ARABIA - Tags: POLITICS CIVIL UNREST) BEST QUALITY AVAILABLE 

US President George Bush greets Somalia women and children while visiting US troops in Somalia January 2 

A tired US President George Bush rests and holds a bottle of drinking water as he takes a pause during visiting US troops in Somalia January 2 

Actor and chairman of the President's council on Physical Fitness and Sports Arnold Schwarzenegger (L) helps President George Bush with a weight lifting machine on the South Lawn of the White House May 1, 1991. President Bush and Schwarzenegger were taking part in the Second Great American Workout. REUTERS/Gary Cameron 

U.S. President George Bush, wearing a T-shirt reading "Really I'm fine," celebrates a winning throw during a game of horseshoes at the White House in Washington, U.S., June 6, 1991. Picture taken June 6, 1991. REUTERS/Win McNamee 

President Bush (L) gets a grand welcome home to the White House from granddaughter Jenna (C) after returning from Philadelphia, September 12, 1991. The president's son George W. (Jenna's father) is at rear and her mother Laura Bush is at right. One of the president's dogs is in the foreground. REUTERS/Rick Wilking 

File photo of U.S. President George Bush applauds Pope John Paul II after a welcoming ceremony prior to their audience at the Vatican, on November 8, 1991. Pope John Paul II, the Pole who headed the Roman Catholic Church for 26 years and played a key role in the fall of communism in Europe, died on Saturday evening, the Vatican announced. He was 84. REUTERS/Rick Wilking/FILE ME/GN 

Mother Theresa of Calcutta gestures ash she talks to President George Bush as the two met December 9, 1991 in the Oval office at the White House. Reuters/ Rick Wilking 

US President George Bush waves to reporters while riding in a golf cart with Russian President Boris Yeltsin, after his arrival at the presidential retreat in Camp David Feb 1, 1992. Yeltsin is scheduled to meet Canadian Prime Minister Brian Mulrony. REUTERS/Win McNamee 

U.S. President George H. W. Bush (L) and Soviet President Mikhail Gorbachev shake hands in front of U.S. and Soviet flags at the end of the press conference in Moscow in this file image from July 31, 1991. REUTERS/Rick Wilking/Files (SOVIET UNION - Tags: POLITICS) 

US President George Bush toasts Russian President Boris yeltsin in Moscow January 3 after signing a historic START-2 treaty 

Israelli Prime Minister Yitzhak Rabin and President George Bush (L) speak to the press at Bush's seaside retreat in Kennebunkport on 10 August, 1992 shortly after Rabin arrived in Maine. REUTERS/Win McNamee 

President George Bush addresses reporters at the White House, October 23, on the release of documents by Hanoi on Americans missing in Southeast Asia. Bush, with Senator John McCain (L) and Senator John Kerry, said the information will allow the United States to "begin writing the last chapter of the Vietnam War." REUTERS/Mike Theiler US ELECTIONS AS 

Former US. President George Bush (L) and First Lady Barbara Bush join their son George W. Bush and his wife Laura Bush at a rally in downtown Houston November 7 

Democratic Presidential candidate Govenor Bill Clinton (L) answers a question as president George Bush tries to interject a point during the Presidential debate October 19th. 

President George Bush(l) gestures while standing next to former President Gerald Ford during a campaign rally at the Gerald Ford Museum here, October 29. 

President George Bush looks back over the top of the train he is travelling on at supporters in a building during a campaign stop here Oct. 31. 

President George Bush rallies supporters at The Palace in Auburn Hills, November 1, as he brought additional charges about Gov. Clinton and Clinton's missing ROTC files. 

President George Bush concedes the election to president-elect Bill-Clinton as Bush's wife Barbara looks on(L), in Houston November 3. In background are Bush's son Marvin and his wife Margaret. 

Outgoing President George Bush (R) applauds newly inaugurated President BIll Clinton (L) shortly after his swearing in, January 20 

Former US President George Bush (second from left) wipes his eye after his son, George W. Bush, was sworn in as Texas' newest governor January 17. Bush's wife Barbara (L) and their twin grandaughters Jenna and Barbara (R) applaud 

U.S. President Clinton (C) talks with former presidents Jimmy Carter (L) and George Bush (R) aboard Air Force One November 6 while travelling to attend the funeral of slain Israeli President Yitzhak Rabin 

Former President George Bush (C) tries to make room for his portrait as Gov. George Bush (L) of Texas and Gov. Jeb Bush (R) of Florida horse around during a family portrait session, June 10. The Bush family was in Houston celebrating the former president and wife Barbara's (R, rear) birthdays. aal/Photo by Adrees A.

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Bush family members pose for a group portrait before celebrating their parents' birthdays, June 10 in Houston. Seated in the front row are (L-R) Neil Bush, Texas Gov. George W. Bush, President George Bush, Florida Gov. Jeb Bush, Marvin Bush and Dorothy Koch. Spouses standing in the back row are (L-R) Sharon Bush, Laura Bush, Barbara Bush, Columba Bush, Margaret Bush and Bobby Koch. aal/Photo by Adrees A.

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Republican presidential candidate George W. Bush (L) listens to his father, former president George Bush, during a concert by the Bellamy Brothers, January 29. The Bushes made the appearance during a campaign event leading up to the February 1 New Hampshire primary.

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Former President George Bush acknowledges cheers after arriving with his wife, former first lady Barbara Bush (R), at the Republican National Convention in Philadelphia, July 31, 2000. [Earlier in the day, Bush's son, Texas Gov. George W. Bush, was formally nominated for president of the United States.] 

- FILE PHOTO 20 JAN01 -U.S. President George W. Bush sits at his desk in the Oval Office for the first time on Inaugural Day, in this January 20, 2001 file photo, as his father, former President George H.W. Bush looks on. The photo was released by the White House to mark President Bush's 100 days in office. (CREDIT REUTERS/Eric Draper/White House Photo) 

Former U.S. President George H.W. Bush waves while standing with his wife Barbara (R) and Congressional Medal of Honor recipient Thomas Hudner Jr. (L) during a tribute to veterans at the 2004 Republican National Convention at Madison Square Garden in New York, August 30, 2004. Republicans opened their four-day national convention on Monday [with salutes to President George W. Bush's wartime leadership and repeated reminders of his aggressive response to the September 11, 2001, attacks.] 

Former President George H.W. Bush walks the gangway as he arrives for the christening ceremony of the USS George H.W. Bush at Northrop-Grumman's shipyard in Newport News, Virginia in this October 7, 2006 file photo. The Navy's Nimitz-class aircraft carrier is scheduled to enter service in late 2008. REUTERS/Kevin Lamarque/Files (UNITED STATES - Tags: POLITICS) 

Former President George H.W. Bush looks up as he introduces U.S. President Barack Obama to speak at the Points of Light forum at Texas A&M University in College Station, Texas October 16, 2009. REUTERS/Kevin Lamarque (UNITED STATES POLITICS) 

Former U.S. President George H.W. Bush (R) watches as his son, former President George W. Bush, throws a ceremonial first pitch prior to the start of Game 4 of Major League Baseball's World Series between the San Francisco Giants and the Texas Rangers, in Arlington, Texas, October 31, 2010. REUTERS/Brian Snyder (UNITED STATES - Tags: SPORT BASEBALL IMAGES OF THE DAY) 

Former U.S. President George H.W. Bush does the Texas Rangers' deer horn gesture during Game 4 of Major League Baseball's World Series against the San Francisco Giants, in Arlington, Texas, October 31, 2010. REUTERS/Brian Snyder (UNITED STATES - Tags: SPORT BASEBALL HEADSHOT) 

Former U.S. President George H.W. Bush looks into the audience during the Medal of Freedom ceremony at the White House in Washington February 15, 2011. REUTERS/Larry Downing (UNITED STATES - Tags: POLITICS IMAGES OF THE DAY) 

U.S. President Barack Obama awards the Medal of Freedom to former U.S. President George H.W. Bush during a ceremony to present the awards at the White House in Washington February 15, 2011. REUTERS/Larry Downing (UNITED STATES - Tags: POLITICS) 

Father and son, and former U.S. Presidents, George H.W. Bush (L) and George W. Bush, shake hands at the dedication for the George W. Bush Presidential Center on the campus of Southern Methodist University in Dallas, Texas April 25, 2013. REUTERS/Mike Stone (UNITED STATES - Tags: POLITICS) 

U.S. President Barack Obama (L) stands alongside (L-R) former presidents George W. Bush, Bill Clinton, George H.W. Bush and Jimmy Carter as they attend the dedication ceremony for the George W. Bush Presidential Center in Dallas, April 25, 2013. Obama is in Texas to stand shoulder-to-shoulder with former president George W. Bush in what could serve as a powerful reminder of the ongoing struggle against terrorism, from the Sept. 11 attacks to the Boston Marathon bombings. REUTERS/Jason Reed (UNITED STATES - Tags: POLITICS) FOR BEST QUALITY IMAGE: ALSO SEE GM1E97T1JAR01 

Former Presidents George W. Bush, and George H.W. Bush arrive at St. Martin's Episcopal Church for funeral services for former first lady Barbara Bush in Houston, Texas, U.S., April 21, 2018. David J. Phillip/Pool via Reuters